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參數(shù)資料
| 型號(hào)： | LMC6036 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Low Power 2.7V Single Supply CMOS Operational Amplifiers |
| 中文描述： | 低功耗為2.7V單電源CMOS運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 13/20頁(yè) |
| 文件大小： | 790K |
| 代理商： | LMC6036 |
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1.0 Application Notes
(Continued)
1.2.3.1 DABP Component Selection Procedure
Component selection for the DABP filter is performed as fol-
lows:
1.
First choose a center frequency (f
). Figure 7 represents
component values that were obtained from the following
computation for a center frequency of 1 kHz.
R2 = R3 = 1/(2
π
f
C)
Given: f
= 1 kHz and C
=
6.8 nF
R2 = R3 = 1/(2
π
x 3 kHz x 6.8 nF) = 23.4 k
(Chosen standard value is
23.7 k
)
2.
Then compute R1 for a desired Q (f
c
/BW) as follows:
R1 = Q x R2.
Choosing a Q of 100,
R1 = 100 x 23.7 k
=
2.37 M
.
1.3 PRINTED-CIRCUIT-BOARD LAYOUT
FOR HIGH-IMPEDANCE WORK
It is generally recognized that any circuit which must operate
with
<
1000 pA of leakage current requires special layout of
the PC board. If one wishes to take advantage of the
ultra-low bias current of the LMC6035/6, typically
<
0.04 pA,
it is essential to have an excellent layout. Fortunately, the
techniques for obtaining low leakages are quite simple. First,
the user must not ignore the surface leakage of the PC
board, even though it may at times appear acceptably low.
Under conditions of high humidity, dust or contamination, the
surface leakage will be appreciable.
To minimize the effect of any surface leakage, lay out a ring
of foil completely surrounding the LMC6035 or LMC6036 in-
puts and the terminals of capacitors, diodes, conductors, re-
sistors, relay terminals, etc. connected to the op amp’s in-
puts. See Figure 8 To have a significant effect, guard rings
should be placed on both the top and bottom of the PC
board. This PC foil must then be connected to a voltage
which is at the same voltage as the amplifier inputs, since no
leakage current can flow between two points at the same po-
tential. For example, a PC board trace-to-pad resistance of
10
12
, which is normally considered a very large resistance,
could leak 5 pAif the trace were a 5V bus adjacent to the pad
of an input. This would cause a 100 times degradation from
the amplifiers actual performance. However, if a guard ring is
held within 5 mV of the inputs, then even a resistance of
10
11
would cause only 0.05 pA of leakage current, or per-
haps a minor (2:1) degradation of the amplifier’s perfor-
mance. See Figure 9a, b, c for typical connections of guard
rings for standard op amp configurations. If both inputs are
active and at high impedance, the guard can be tied to
ground and still provide some protection; see Figure 9 d
DS012830-50
FIGURE 7. 2 Pole, 1 kHz Active, Bandpass Filter
DS012830-7
FIGURE 8. Example, using the LMC6036
of Guard Ring in P.C. Board Layout
L
www.national.com
13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMC6036IM | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMC6036IM | 制造商:Texas Instruments 功能描述:IC OP AMP QUAD CMOS 6036 SOIC14 |
| LMC6036IM/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMC6036IMT | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMC6036IMT/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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